I have two differently sized SSDs. One is a m.2 4TB, the other a sata 2TB. I set these to be a mirrored cache. I want to use the leftover 2 TB on the m.2 for VMs. The gui doesn't seem to have any support for this but it should be possible via command line. I am however unfamiliar with the process as well as I'm unsure what the best method is for unraid to mount on boot.
Is it as simple as just making an entry in Syslinux configuration?